Uh, no. Posts like this indicate how naive some premeds are towards lawyers. You don't need any experience in medical field, let alone a degree, to be a successful malpractice lawyer. As long as you have strong grasp in torts, you will be more than able to get into malpractice. Keep in mind though, malpractice isn't as always lucrative as people think - in fact, I met one lawyer who was in malpractice with other insurance areas besides medicine (keeps your market open).
If you are interested in law, become a lawyer. If you are interested in medicine, become a doctor. Pick and choose - don't try to fill up your ego by getting both degrees when in the end, you will end up not using one of them. Oh, and don't give me that crap about someone (n=1 or 2) successful as lawyer and doctor. Anyone who's serious about medicine knows better. If you really like law, just buy some books while you are on vacation. That'll do.
So, couple things to OP and other MD/JD supporters:
1) Lawyer isn't what you see in Law and Order. If you think that way, well maybe you think every doctor is like Dr. House.
2) There is really only one case that I can think of that MD/JD is applicable, and that's with health care policy. But even here, you don't need JD to get into policy-making or politics in general.
3) There is no such thing as physician-lawyer. Choose one, and stay with one. Oh, and maybe use Search engine? This was asked before several times.